Zhai, Edwin
2007-Jan-11 14:11 UTC
[Xen-devel] [PATCH 6/8] HVM save restore: guest memory handling
[PATCH 6/8] HVM save restore: guest memory handling
Signed-off-by: Zhai Edwin <edwin.zhai@intel.com>
add support for save/restore HVM guest memory
diff -r bb1c450b2739 tools/libxc/xc_hvm_restore.c
--- a/tools/libxc/xc_hvm_restore.c Thu Jan 11 21:03:11 2007 +0800
+++ b/tools/libxc/xc_hvm_restore.c Thu Jan 11 21:05:45 2007 +0800
@@ -31,6 +31,40 @@
#include <xen/hvm/ioreq.h>
#include <xen/hvm/params.h>
#include <xen/hvm/e820.h>
+
+/* max mfn of the whole machine */
+static unsigned long max_mfn;
+
+/* virtual starting address of the hypervisor */
+static unsigned long hvirt_start;
+
+/* #levels of page tables used by the currrent guest */
+static unsigned int pt_levels;
+
+/* total number of pages used by the current guest */
+static unsigned long max_pfn;
+
+/* A table mapping each PFN to its new MFN. */
+static xen_pfn_t *p2m = NULL;
+
+static ssize_t
+read_exact(int fd, void *buf, size_t count)
+{
+ int r = 0, s;
+ unsigned char *b = buf;
+
+ while (r < count) {
+ s = read(fd, &b[r], count - r);
+ if ((s == -1) && (errno == EINTR))
+ continue;
+ if (s <= 0) {
+ break;
+ }
+ r += s;
+ }
+
+ return (r == count) ? 1 : 0;
+}
int xc_hvm_restore(int xc_handle, int io_fd,
uint32_t dom, unsigned long nr_pfns,
@@ -38,5 +72,289 @@ int xc_hvm_restore(int xc_handle, int io
unsigned int console_evtchn, unsigned long *console_mfn,
unsigned int pae, unsigned int apic)
{
- return 0;
+ DECLARE_DOMCTL;
+
+ /* The new domain''s shared-info frame number. */
+ unsigned long shared_info_frame;
+
+ /* A copy of the CPU context of the guest. */
+ vcpu_guest_context_t ctxt;
+
+ char *region_base;
+
+ unsigned long buf[PAGE_SIZE/sizeof(unsigned long)];
+
+ xc_dominfo_t info;
+ unsigned int rc = 1, n, i;
+ uint32_t rec_len, nr_vcpus;
+ hvm_domain_context_t hvm_ctxt;
+ unsigned long long v_end, memsize;
+ unsigned long shared_page_nr;
+
+ unsigned long mfn, pfn;
+ unsigned int prev_pc, this_pc;
+ int verify = 0;
+
+ /* Types of the pfns in the current region */
+ unsigned long region_pfn_type[MAX_BATCH_SIZE];
+
+ /* hvm guest mem size (Mb) */
+ memsize = (unsigned long long)*store_mfn;
+ v_end = memsize << 20;
+
+ DPRINTF("xc_hvm_restore:dom=%d, nr_pfns=0x%lx, store_evtchn=%d,
*store_mfn=%ld, console_evtchn=%d, *console_mfn=%ld, pae=%u, apic=%u.\n",
+ dom, nr_pfns, store_evtchn, *store_mfn, console_evtchn,
*console_mfn, pae, apic);
+
+ max_pfn = nr_pfns;
+
+ if(!get_platform_info(xc_handle, dom,
+ &max_mfn, &hvirt_start, &pt_levels)) {
+ ERROR("Unable to get platform info.");
+ return 1;
+ }
+
+ DPRINTF("xc_hvm_restore start: max_pfn = %lx, max_mfn = %lx,
hvirt_start=%lx, pt_levels=%d\n",
+ max_pfn,
+ max_mfn,
+ hvirt_start,
+ pt_levels);
+
+ if (mlock(&ctxt, sizeof(ctxt))) {
+ /* needed for build dom0 op, but might as well do early */
+ ERROR("Unable to mlock ctxt");
+ return 1;
+ }
+
+
+ p2m = malloc(max_pfn * sizeof(xen_pfn_t));
+
+ if (p2m == NULL) {
+ ERROR("memory alloc failed");
+ errno = ENOMEM;
+ goto out;
+ }
+
+ /* Get the domain''s shared-info frame. */
+ domctl.cmd = XEN_DOMCTL_getdomaininfo;
+ domctl.domain = (domid_t)dom;
+ if (xc_domctl(xc_handle, &domctl) < 0) {
+ ERROR("Could not get information on new domain");
+ goto out;
+ }
+ shared_info_frame = domctl.u.getdomaininfo.shared_info_frame;
+
+ if(xc_domain_setmaxmem(xc_handle, dom, PFN_TO_KB(max_pfn)) != 0) {
+ errno = ENOMEM;
+ goto out;
+ }
+
+ for ( i = 0; i < max_pfn; i++ )
+ p2m[i] = i;
+ for ( i = HVM_BELOW_4G_RAM_END >> PAGE_SHIFT; i < max_pfn; i++ )
+ p2m[i] += HVM_BELOW_4G_MMIO_LENGTH >> PAGE_SHIFT;
+
+ /* Allocate memory for HVM guest, skipping VGA hole 0xA0000-0xC0000. */
+ rc = xc_domain_memory_populate_physmap(
+ xc_handle, dom, (max_pfn > 0xa0) ? 0xa0 : max_pfn,
+ 0, 0, &p2m[0x00]);
+ if ( (rc == 0) && (max_pfn > 0xc0) )
+ rc = xc_domain_memory_populate_physmap(
+ xc_handle, dom, max_pfn - 0xc0, 0, 0, &p2m[0xc0]);
+ if ( rc != 0 )
+ {
+ PERROR("Could not allocate memory for HVM guest.\n");
+ goto out;
+ }
+
+
+ /**********XXXXXXXXXXXXXXXX******************/
+ if (xc_domain_getinfo(xc_handle, dom, 1, &info) != 1) {
+ ERROR("Could not get domain info");
+ return 1;
+ }
+
+ domctl.cmd = XEN_DOMCTL_getdomaininfo;
+ domctl.domain = (domid_t)dom;
+ if (xc_domctl(xc_handle, &domctl) < 0) {
+ ERROR("Could not get information on new domain");
+ goto out;
+ }
+
+ for ( i = 0; i < max_pfn; i++)
+ p2m[i] = i;
+
+ prev_pc = 0;
+
+ n = 0;
+ while (1) {
+
+ int j;
+
+ this_pc = (n * 100) / max_pfn;
+ if ( (this_pc - prev_pc) >= 5 )
+ {
+ PPRINTF("\b\b\b\b%3d%%", this_pc);
+ prev_pc = this_pc;
+ }
+
+ if (!read_exact(io_fd, &j, sizeof(int))) {
+ ERROR("HVM restore Error when reading batch size");
+ goto out;
+ }
+
+ PPRINTF("batch %d\n",j);
+
+ if (j == -1) {
+ verify = 1;
+ DPRINTF("Entering page verify mode\n");
+ continue;
+ }
+
+ if (j == 0)
+ break; /* our work here is done */
+
+ if (j > MAX_BATCH_SIZE) {
+ ERROR("Max batch size exceeded. Giving up.");
+ goto out;
+ }
+
+ if (!read_exact(io_fd, region_pfn_type, j*sizeof(unsigned long))) {
+ ERROR("Error when reading region pfn types");
+ goto out;
+ }
+
+ region_base = xc_map_foreign_batch(
+ xc_handle, dom, PROT_WRITE, region_pfn_type, j);
+
+ for ( i = 0; i < j; i++ )
+ {
+ void *page;
+
+ pfn = region_pfn_type[i];
+ if ( pfn > max_pfn )
+ {
+ ERROR("pfn out of range");
+ goto out;
+ }
+
+ if ( pfn >= 0xa0 && pfn < 0xc0) {
+ ERROR("hvm restore:pfn in vga hole");
+ goto out;
+ }
+
+
+ mfn = p2m[pfn];
+
+ /* In verify mode, we use a copy; otherwise we work in place */
+ page = verify ? (void *)buf : (region_base + i*PAGE_SIZE);
+
+ if (!read_exact(io_fd, page, PAGE_SIZE)) {
+ ERROR("Error when reading page (%x)", i);
+ goto out;
+ }
+
+ if (verify) {
+
+ int res = memcmp(buf, (region_base + i*PAGE_SIZE), PAGE_SIZE);
+
+ if (res) {
+
+ int v;
+
+ DPRINTF("************** pfn=%lx mfn=%lx gotcs=%08lx
"
+ "actualcs=%08lx\n", pfn, p2m[pfn],
+ csum_page(region_base + i*PAGE_SIZE),
+ csum_page(buf));
+
+ for (v = 0; v < 4; v++) {
+
+ unsigned long *p = (unsigned long *)
+ (region_base + i*PAGE_SIZE);
+ if (buf[v] != p[v])
+ DPRINTF(" %d: %08lx %08lx\n", v,
buf[v], p[v]);
+ }
+ }
+ }
+
+ } /* end of ''batch'' for loop */
+ munmap(region_base, j*PAGE_SIZE);
+ n+= j; /* crude stats */
+
+ }/*while 1*/
+
+/* xc_set_hvm_param(xc_handle, dom, HVM_PARAM_APIC_ENABLED, apic);*/
+ xc_set_hvm_param(xc_handle, dom, HVM_PARAM_PAE_ENABLED, pae);
+ xc_set_hvm_param(xc_handle, dom, HVM_PARAM_STORE_EVTCHN, store_evtchn);
+
+ if ( v_end > HVM_BELOW_4G_RAM_END )
+ shared_page_nr = (HVM_BELOW_4G_RAM_END >> PAGE_SHIFT) - 1;
+ else
+ shared_page_nr = (v_end >> PAGE_SHIFT) - 1;
+
+ xc_set_hvm_param(xc_handle, dom, HVM_PARAM_STORE_PFN, shared_page_nr-1);
+ xc_set_hvm_param(xc_handle, dom, HVM_PARAM_BUFIOREQ_PFN, shared_page_nr-2);
+ xc_set_hvm_param(xc_handle, dom, HVM_PARAM_IOREQ_PFN, shared_page_nr);
+
+ /* caculate the store_mfn , wrong val cause hang when introduceDomain */
+ *store_mfn = (v_end >> PAGE_SHIFT) - 2;
+ DPRINTF("hvm restore:calculate new
store_mfn=0x%lx,v_end=0x%llx..\n", *store_mfn, v_end);
+
+ /* restore hvm context including pic/pit/shpage */
+ if (!read_exact(io_fd, &rec_len, sizeof(uint32_t))) {
+ ERROR("error read hvm context size!\n");
+ goto out;
+ }
+ if (rec_len != sizeof(hvm_ctxt)) {
+ ERROR("hvm context size dismatch!\n");
+ goto out;
+ }
+
+ if (!read_exact(io_fd, &hvm_ctxt, sizeof(hvm_ctxt))) {
+ ERROR("error read hvm context!\n");
+ goto out;
+ }
+
+ if (( rc = xc_domain_hvm_setcontext(xc_handle, dom, &hvm_ctxt))) {
+ ERROR("error set hvm context!\n");
+ goto out;
+ }
+
+ if (!read_exact(io_fd, &nr_vcpus, sizeof(uint32_t))) {
+ ERROR("error read nr vcpu !\n");
+ goto out;
+ }
+ DPRINTF("hvm restore:get nr_vcpus=%d.\n", nr_vcpus);
+
+ for (i =0; i < nr_vcpus; i++) {
+ if (!read_exact(io_fd, &rec_len, sizeof(uint32_t))) {
+ ERROR("error read vcpu context size!\n");
+ goto out;
+ }
+ if (rec_len != sizeof(ctxt)) {
+ ERROR("vcpu context size dismatch!\n");
+ goto out;
+ }
+
+ if (!read_exact(io_fd, &(ctxt), sizeof(ctxt))) {
+ ERROR("error read vcpu context.\n");
+ goto out;
+ }
+
+ if ( (rc = xc_vcpu_setcontext(xc_handle, dom, i, &ctxt)) ) {
+ ERROR("Could not set vcpu context, rc=%d", rc);
+ goto out;
+ }
+ }
+
+ rc = 0;
+ goto out;
+
+ out:
+ if ( (rc != 0) && (dom != 0) )
+ xc_domain_destroy(xc_handle, dom);
+ free(p2m);
+
+ DPRINTF("Restore exit with rc=%d\n", rc);
+
+ return rc;
}
diff -r bb1c450b2739 tools/libxc/xc_hvm_save.c
--- a/tools/libxc/xc_hvm_save.c Thu Jan 11 21:03:11 2007 +0800
+++ b/tools/libxc/xc_hvm_save.c Thu Jan 11 21:05:10 2007 +0800
@@ -32,9 +32,696 @@
#include "xg_private.h"
#include "xg_save_restore.h"
+/*
+** Default values for important tuning parameters. Can override by passing
+** non-zero replacement values to xc_hvm_save().
+**
+** XXX SMH: should consider if want to be able to override MAX_MBIT_RATE too.
+**
+*/
+#define DEF_MAX_ITERS 29 /* limit us to 30 times round loop */
+#define DEF_MAX_FACTOR 3 /* never send more than 3x nr_pfns */
+
+/* max mfn of the whole machine */
+static unsigned long max_mfn;
+
+/* virtual starting address of the hypervisor */
+static unsigned long hvirt_start;
+
+/* #levels of page tables used by the currrent guest */
+static unsigned int pt_levels;
+
+/* total number of pages used by the current guest */
+static unsigned long max_pfn;
+
+/*
+** During (live) save/migrate, we maintain a number of bitmaps to track
+** which pages we have to send, to fixup, and to skip.
+*/
+
+#define BITS_PER_LONG (sizeof(unsigned long) * 8)
+#define BITMAP_SIZE ((max_pfn + BITS_PER_LONG - 1) / 8)
+
+#define BITMAP_ENTRY(_nr,_bmap) \
+ ((unsigned long *)(_bmap))[(_nr)/BITS_PER_LONG]
+
+#define BITMAP_SHIFT(_nr) ((_nr) % BITS_PER_LONG)
+
+static inline int test_bit (int nr, volatile void * addr)
+{
+ return (BITMAP_ENTRY(nr, addr) >> BITMAP_SHIFT(nr)) & 1;
+}
+
+static inline void clear_bit (int nr, volatile void * addr)
+{
+ BITMAP_ENTRY(nr, addr) &= ~(1UL << BITMAP_SHIFT(nr));
+}
+
+static inline int permute( int i, int nr, int order_nr )
+{
+ /* Need a simple permutation function so that we scan pages in a
+ pseudo random order, enabling us to get a better estimate of
+ the domain''s page dirtying rate as we go (there are often
+ contiguous ranges of pfns that have similar behaviour, and we
+ want to mix them up. */
+
+ /* e.g. nr->oder 15->4 16->4 17->5 */
+ /* 512MB domain, 128k pages, order 17 */
+
+ /*
+ QPONMLKJIHGFEDCBA
+ QPONMLKJIH
+ GFEDCBA
+ */
+
+ /*
+ QPONMLKJIHGFEDCBA
+ EDCBA
+ QPONM
+ LKJIHGF
+ */
+
+ do { i = ((i>>(order_nr-10)) | ( i<<10 ) ) &
((1<<order_nr)-1); }
+ while ( i >= nr ); /* this won''t ever loop if nr is a power of
2 */
+
+ return i;
+}
+
+static uint64_t tv_to_us(struct timeval *new)
+{
+ return (new->tv_sec * 1000000) + new->tv_usec;
+}
+
+static uint64_t llgettimeofday(void)
+{
+ struct timeval now;
+ gettimeofday(&now, NULL);
+ return tv_to_us(&now);
+}
+
+static uint64_t tv_delta(struct timeval *new, struct timeval *old)
+{
+ return ((new->tv_sec - old->tv_sec)*1000000 ) +
+ (new->tv_usec - old->tv_usec);
+}
+
+
+#define RATE_IS_MAX() (0)
+#define ratewrite(_io_fd, _buf, _n) write((_io_fd), (_buf), (_n))
+#define initialize_mbit_rate()
+
+static inline ssize_t write_exact(int fd, void *buf, size_t count)
+{
+ if(write(fd, buf, count) != count)
+ return 0;
+ return 1;
+}
+
+static int print_stats(int xc_handle, uint32_t domid, int pages_sent,
+ xc_shadow_op_stats_t *stats, int print)
+{
+ static struct timeval wall_last;
+ static long long d0_cpu_last;
+ static long long d1_cpu_last;
+
+ struct timeval wall_now;
+ long long wall_delta;
+ long long d0_cpu_now, d0_cpu_delta;
+ long long d1_cpu_now, d1_cpu_delta;
+
+ gettimeofday(&wall_now, NULL);
+
+ d0_cpu_now = xc_domain_get_cpu_usage(xc_handle, 0, /* FIXME */ 0)/1000;
+ d1_cpu_now = xc_domain_get_cpu_usage(xc_handle, domid, /* FIXME */ 0)/1000;
+
+ if ( (d0_cpu_now == -1) || (d1_cpu_now == -1) )
+ DPRINTF("ARRHHH!!\n");
+
+ wall_delta = tv_delta(&wall_now,&wall_last)/1000;
+
+ if (wall_delta == 0) wall_delta = 1;
+
+ d0_cpu_delta = (d0_cpu_now - d0_cpu_last)/1000;
+ d1_cpu_delta = (d1_cpu_now - d1_cpu_last)/1000;
+
+ if (print)
+ DPRINTF(
+ "delta %lldms, dom0 %d%%, target %d%%, sent %dMb/s, "
+ "dirtied %dMb/s %" PRId32 " pages\n",
+ wall_delta,
+ (int)((d0_cpu_delta*100)/wall_delta),
+ (int)((d1_cpu_delta*100)/wall_delta),
+ (int)((pages_sent*PAGE_SIZE)/(wall_delta*(1000/8))),
+ (int)((stats->dirty_count*PAGE_SIZE)/(wall_delta*(1000/8))),
+ stats->dirty_count);
+
+ d0_cpu_last = d0_cpu_now;
+ d1_cpu_last = d1_cpu_now;
+ wall_last = wall_now;
+
+ return 0;
+}
+
+static int analysis_phase(int xc_handle, uint32_t domid, int max_pfn,
+ unsigned long *arr, int runs)
+{
+ long long start, now;
+ xc_shadow_op_stats_t stats;
+ int j;
+
+ start = llgettimeofday();
+
+ for (j = 0; j < runs; j++) {
+ int i;
+
+ xc_shadow_control(xc_handle, domid, XEN_DOMCTL_SHADOW_OP_CLEAN,
+ arr, max_pfn, NULL, 0, NULL);
+ DPRINTF("#Flush\n");
+ for ( i = 0; i < 40; i++ ) {
+ usleep(50000);
+ now = llgettimeofday();
+ xc_shadow_control(xc_handle, domid, XEN_DOMCTL_SHADOW_OP_PEEK,
+ NULL, 0, NULL, 0, &stats);
+
+ DPRINTF("now= %lld faults= %"PRId32" dirty=
%"PRId32"\n",
+ ((now-start)+500)/1000,
+ stats.fault_count, stats.dirty_count);
+ }
+ }
+
+ return -1;
+}
+
+static int suspend_and_state(int (*suspend)(int), int xc_handle, int io_fd,
+ int dom, xc_dominfo_t *info,
+ vcpu_guest_context_t *ctxt)
+{
+ int i = 0;
+
+ if (!(*suspend)(dom)) {
+ ERROR("Suspend request failed");
+ return -1;
+ }
+
+ retry:
+
+ if (xc_domain_getinfo(xc_handle, dom, 1, info) != 1) {
+ ERROR("Could not get domain info");
+ return -1;
+ }
+
+ if ( xc_vcpu_getcontext(xc_handle, dom, 0 /* XXX */, ctxt))
+ ERROR("Could not get vcpu context");
+
+
+ if (info->shutdown && info->shutdown_reason ==
SHUTDOWN_suspend)
+ return 0; // success
+
+ if (info->paused) {
+ // try unpausing domain, wait, and retest
+ xc_domain_unpause( xc_handle, dom );
+
+ ERROR("Domain was paused. Wait and re-test.");
+ usleep(10000); // 10ms
+
+ goto retry;
+ }
+
+
+ if( ++i < 100 ) {
+ ERROR("Retry suspend domain.");
+ usleep(10000); // 10ms
+ goto retry;
+ }
+
+ ERROR("Unable to suspend domain.");
+
+ return -1;
+}
+
int xc_hvm_save(int xc_handle, int io_fd, uint32_t dom, uint32_t max_iters,
uint32_t max_factor, uint32_t flags, int (*suspend)(int))
{
-
- return 0;
-}
+ xc_dominfo_t info;
+
+ int rc = 1, i, last_iter, iter = 0;
+ int live = (flags & XCFLAGS_LIVE);
+ int debug = (flags & XCFLAGS_DEBUG);
+ int sent_last_iter, skip_this_iter;
+
+ /* The new domain''s shared-info frame number. */
+ unsigned long shared_info_frame;
+
+ /* A copy of the CPU context of the guest. */
+ vcpu_guest_context_t ctxt;
+
+ /* A table containg the type of each PFN (/not/ MFN!). */
+ unsigned long *pfn_type = NULL;
+ unsigned long *pfn_batch = NULL;
+
+ /* A copy of hvm domain context */
+ hvm_domain_context_t hvm_ctxt;
+
+ /* Live mapping of shared info structure */
+ shared_info_t *live_shinfo = NULL;
+
+ /* base of the region in which domain memory is mapped */
+ unsigned char *region_base = NULL;
+
+ uint32_t nr_pfns, rec_size, nr_vcpus;
+ unsigned long *page_array = NULL;
+
+ /* power of 2 order of max_pfn */
+ int order_nr;
+
+ /* bitmap of pages:
+ - that should be sent this iteration (unless later marked as skip);
+ - to skip this iteration because already dirty; */
+ unsigned long *to_send = NULL, *to_skip = NULL;
+
+ xc_shadow_op_stats_t stats;
+
+ unsigned long total_sent = 0;
+
+ DPRINTF("xc_hvm_save:dom=%d, max_iters=%d, max_factor=%d, flags=0x%x,
live=%d, debug=%d.\n",
+ dom, max_iters, max_factor, flags,
+ live, debug);
+
+ /* If no explicit control parameters given, use defaults */
+ if(!max_iters)
+ max_iters = DEF_MAX_ITERS;
+ if(!max_factor)
+ max_factor = DEF_MAX_FACTOR;
+
+ initialize_mbit_rate();
+
+ if(!get_platform_info(xc_handle, dom,
+ &max_mfn, &hvirt_start, &pt_levels)) {
+ ERROR("HVM:Unable to get platform info.");
+ return 1;
+ }
+
+ if (xc_domain_getinfo(xc_handle, dom, 1, &info) != 1) {
+ ERROR("HVM:Could not get domain info");
+ return 1;
+ }
+ nr_vcpus = info.nr_online_vcpus;
+
+ if (mlock(&ctxt, sizeof(ctxt))) {
+ ERROR("HVM:Unable to mlock ctxt");
+ return 1;
+ }
+
+ /* Only have to worry about vcpu 0 even for SMP */
+ if (xc_vcpu_getcontext(xc_handle, dom, 0, &ctxt)) {
+ ERROR("HVM:Could not get vcpu context");
+ goto out;
+ }
+ shared_info_frame = info.shared_info_frame;
+
+ /* A cheesy test to see whether the domain contains valid state. */
+ if (ctxt.ctrlreg[3] == 0)
+ {
+ ERROR("Domain is not in a valid HVM guest state");
+ goto out;
+ }
+
+ /* cheesy sanity check */
+ if ((info.max_memkb >> (PAGE_SHIFT - 10)) > max_mfn) {
+ ERROR("Invalid HVM state record -- pfn count out of range:
%lu",
+ (info.max_memkb >> (PAGE_SHIFT - 10)));
+ goto out;
+ }
+
+ /* Map the shared info frame */
+ if(!(live_shinfo = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
+ PROT_READ, shared_info_frame))) {
+ ERROR("HVM:Couldn''t map live_shinfo");
+ goto out;
+ }
+
+ max_pfn = live_shinfo->arch.max_pfn;
+
+ DPRINTF("saved hvm domain info:max_memkb=0x%lx, max_mfn=0x%lx,
nr_pages=0x%lx\n", info.max_memkb, max_mfn, info.nr_pages);
+
+ /* nr_pfns: total pages excluding vga acc mem
+ * max_pfn: nr_pfns + 0x20 vga hole(0xa0~0xc0)
+ * getdomaininfo.tot_pages: all the allocated pages for this domain
+ */
+ if (live) {
+ ERROR("hvm domain doesn''t support live migration
now.\n");
+ goto out;
+
+ if (xc_shadow_control(xc_handle, dom,
+ XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY,
+ NULL, 0, NULL, 0, NULL) < 0) {
+ ERROR("Couldn''t enable shadow mode");
+ goto out;
+ }
+
+ /* excludes vga acc mem */
+ nr_pfns = info.nr_pages - 0x800;
+
+ last_iter = 0;
+ DPRINTF("hvm domain live migration debug start: logdirty
enable.\n");
+ } else {
+ /* This is a non-live suspend. Issue the call back to get the
+ domain suspended */
+
+ last_iter = 1;
+
+ /* suspend hvm domain */
+ if (suspend_and_state(suspend, xc_handle, io_fd, dom, &info,
&ctxt)) {
+ ERROR("HVM Domain appears not to have suspended");
+ goto out;
+ }
+ nr_pfns = info.nr_pages;
+ DPRINTF("after suspend hvm domain nr_pages=0x%x.\n",
nr_pfns);
+ }
+
+ DPRINTF("after 1st handle hvm domain nr_pfns=0x%x, nr_pages=0x%lx,
max_memkb=0x%lx, live=%d.\n",
+ nr_pfns,
+ info.nr_pages,
+ info.max_memkb,
+ live);
+
+ nr_pfns = info.nr_pages;
+
+ /*XXX: caculate the VGA hole*/
+ max_pfn = nr_pfns + 0x20;
+
+ skip_this_iter = 0;/*XXX*/
+ /* pretend we sent all the pages last iteration */
+ sent_last_iter = max_pfn;
+
+ /* calculate the power of 2 order of max_pfn, e.g.
+ 15->4 16->4 17->5 */
+ for (i = max_pfn-1, order_nr = 0; i ; i >>= 1, order_nr++)
+ continue;
+
+ /* Setup to_send / to_fix and to_skip bitmaps */
+ to_send = malloc(BITMAP_SIZE);
+ to_skip = malloc(BITMAP_SIZE);
+
+ if (!to_send ||!to_skip) {
+ ERROR("Couldn''t allocate to_send array");
+ goto out;
+ }
+
+ memset(to_send, 0xff, BITMAP_SIZE);
+
+ if (lock_pages(to_send, BITMAP_SIZE)) {
+ ERROR("Unable to lock to_send");
+ return 1;
+ }
+
+ /* (to fix is local only) */
+ if (lock_pages(to_skip, BITMAP_SIZE)) {
+ ERROR("Unable to lock to_skip");
+ return 1;
+ }
+
+ analysis_phase(xc_handle, dom, max_pfn, to_skip, 0);
+
+ /* get all the HVM domain pfns */
+ if ( (page_array = (unsigned long *) malloc (sizeof(unsigned long) *
max_pfn)) == NULL) {
+ ERROR("HVM:malloc fail!\n");
+ goto out;
+ }
+
+ for ( i = 0; i < max_pfn; i++)
+ page_array[i] = i;
+
+
+ /* We want zeroed memory so use calloc rather than malloc. */
+ pfn_type = calloc(MAX_BATCH_SIZE, sizeof(*pfn_type));
+ pfn_batch = calloc(MAX_BATCH_SIZE, sizeof(*pfn_batch));
+
+ if ((pfn_type == NULL) || (pfn_batch == NULL)) {
+ ERROR("failed to alloc memory for pfn_type and/or pfn_batch
arrays");
+ errno = ENOMEM;
+ goto out;
+ }
+
+ if (lock_pages(pfn_type, MAX_BATCH_SIZE * sizeof(*pfn_type))) {
+ ERROR("Unable to lock");
+ goto out;
+ }
+
+ /* Start writing out the saved-domain record. */
+ if (!write_exact(io_fd, &max_pfn, sizeof(unsigned long))) {
+ ERROR("write: max_pfn");
+ goto out;
+ }
+
+ while(1) {
+
+ unsigned int prev_pc, sent_this_iter, N, batch;
+
+ iter++;
+ sent_this_iter = 0;
+ skip_this_iter = 0;
+ prev_pc = 0;
+ N=0;
+
+ DPRINTF("Saving HVM domain memory pages: iter %d 0%%",
iter);
+
+ while( N < max_pfn ){
+
+ unsigned int this_pc = (N * 100) / max_pfn;
+
+ if ((this_pc - prev_pc) >= 5) {
+ DPRINTF("\b\b\b\b%3d%%", this_pc);
+ prev_pc = this_pc;
+ }
+
+ /* slightly wasteful to peek the whole array evey time,
+ but this is fast enough for the moment. */
+ if (!last_iter && xc_shadow_control(
+ xc_handle, dom, XEN_DOMCTL_SHADOW_OP_PEEK,
+ to_skip, max_pfn, NULL, 0, NULL) != max_pfn) {
+ ERROR("Error peeking HVM shadow bitmap");
+ goto out;
+ }
+
+
+ /* load pfn_type[] with the mfn of all the pages we''re
doing in
+ this batch. */
+ for (batch = 0; batch < MAX_BATCH_SIZE && N < max_pfn
; N++) {
+
+ int n = permute(N, max_pfn, order_nr);
+
+ if (debug) {
+ DPRINTF("%d pfn= %08lx mfn= %08lx %d \n",
+ iter, (unsigned long)n, page_array[n],
+ test_bit(n, to_send));
+ }
+
+ if (!last_iter && test_bit(n, to_send)&&
test_bit(n, to_skip))
+ skip_this_iter++; /* stats keeping */
+
+ if (!((test_bit(n, to_send) && !test_bit(n, to_skip))
||
+ (test_bit(n, to_send) && last_iter)))
+ continue;
+
+ if (n >= 0xa0 && n < 0xc0) {
+/* DPRINTF("get a vga hole pfn= %x.\n", n);*/
+ continue;
+ }
+ /*
+ ** we get here if:
+ ** 1. page is marked to_send & hasn''t already
been re-dirtied
+ ** 2. (ignore to_skip in last iteration)
+ */
+
+ pfn_batch[batch] = n;
+ pfn_type[batch] = page_array[n];
+
+ batch++;
+ }
+
+ if (batch == 0)
+ goto skip; /* vanishingly unlikely... */
+
+ /* map_foreign use pfns now !*/
+ if ((region_base = xc_map_foreign_batch(
+ xc_handle, dom, PROT_READ, pfn_batch, batch)) == 0) {
+ ERROR("map batch failed");
+ goto out;
+ }
+
+ /* write num of pfns */
+ if(!write_exact(io_fd, &batch, sizeof(unsigned int))) {
+ ERROR("Error when writing to state file (2)");
+ goto out;
+ }
+
+ /* write all the pfns */
+ if(!write_exact(io_fd, pfn_batch, sizeof(unsigned long)*batch)) {
+ ERROR("Error when writing to state file (3)");
+ goto out;
+ }
+
+ if (ratewrite(io_fd, region_base, PAGE_SIZE * batch) != PAGE_SIZE *
batch) {
+ ERROR("ERROR when writting to state file (4)");
+ goto out;
+ }
+
+
+ sent_this_iter += batch;
+
+ munmap(region_base, batch*PAGE_SIZE);
+
+ } /* end of this while loop for this iteration */
+
+ skip:
+
+ total_sent += sent_this_iter;
+
+ DPRINTF("\r %d: sent %d, skipped %d, ",
+ iter, sent_this_iter, skip_this_iter );
+
+ if (last_iter) {
+ print_stats( xc_handle, dom, sent_this_iter, &stats, 1);
+
+ DPRINTF("Total pages sent= %ld (%.2fx)\n",
+ total_sent, ((float)total_sent)/max_pfn );
+ }
+
+ if (last_iter && debug){
+ int minusone = -1;
+ memset(to_send, 0xff, BITMAP_SIZE);
+ debug = 0;
+ DPRINTF("Entering debug resend-all mode\n");
+
+ /* send "-1" to put receiver into debug mode */
+ if(!write_exact(io_fd, &minusone, sizeof(int))) {
+ ERROR("Error when writing to state file (6)");
+ goto out;
+ }
+
+ continue;
+ }
+
+ if (last_iter) break;
+
+ if (live) {
+
+
+ if(
+ ((sent_this_iter > sent_last_iter) && RATE_IS_MAX())
||
+ (iter >= max_iters) ||
+ (sent_this_iter+skip_this_iter < 50) ||
+ (total_sent > max_pfn*max_factor) ) {
+
+ DPRINTF("Start last iteration for HVM domain\n");
+ last_iter = 1;
+
+ if (suspend_and_state(suspend, xc_handle, io_fd, dom,
&info,
+ &ctxt)) {
+ ERROR("Domain appears not to have suspended");
+ goto out;
+ }
+
+ DPRINTF("SUSPEND shinfo %08lx eip %08lx edx %08lx\n",
+ info.shared_info_frame,
+ (unsigned long)ctxt.user_regs.eip,
+ (unsigned long)ctxt.user_regs.edx);
+ }
+
+ if (xc_shadow_control(xc_handle, dom,
+ XEN_DOMCTL_SHADOW_OP_CLEAN, to_send,
+ max_pfn, NULL, 0, &stats) != max_pfn) {
+ ERROR("Error flushing shadow PT");
+ goto out;
+ }
+
+ sent_last_iter = sent_this_iter;
+
+ print_stats(xc_handle, dom, sent_this_iter, &stats, 1);
+
+ }
+
+
+ } /* end of while 1 */
+
+
+ DPRINTF("All HVM memory is saved\n");
+
+ /* Zero terminate */
+ i = 0;
+ if (!write_exact(io_fd, &i, sizeof(int))) {
+ ERROR("Error when writing to state file (6)");
+ goto out;
+ }
+
+ /* save hvm hypervisor state including pic/pit/shpage */
+ if (mlock(&hvm_ctxt, sizeof(hvm_ctxt))) {
+ ERROR("Unable to mlock ctxt");
+ return 1;
+ }
+
+ if (xc_domain_hvm_getcontext(xc_handle, dom, &hvm_ctxt)){
+ ERROR("HVM:Could not get hvm context");
+ goto out;
+ }
+
+ rec_size = sizeof(hvm_ctxt);
+ if (!write_exact(io_fd, &rec_size, sizeof(uint32_t))) {
+ ERROR("error write hvm ctxt size");
+ goto out;
+ }
+
+ if ( !write_exact(io_fd, &hvm_ctxt, sizeof(hvm_ctxt)) ) {
+ ERROR("write HVM info failed!\n");
+ }
+
+ /* save vcpu/vmcs context */
+ if (!write_exact(io_fd, &nr_vcpus, sizeof(uint32_t))) {
+ ERROR("error write nr vcpus");
+ goto out;
+ }
+
+ /*XXX: need a online map to exclude down cpu */
+ for (i = 0; i < nr_vcpus; i++) {
+
+ if (xc_vcpu_getcontext(xc_handle, dom, i, &ctxt)) {
+ ERROR("HVM:Could not get vcpu context");
+ goto out;
+ }
+
+ rec_size = sizeof(ctxt);
+ DPRINTF("write %d vcpucontext of total %d.\n", i, nr_vcpus);
+ if (!write_exact(io_fd, &rec_size, sizeof(uint32_t))) {
+ ERROR("error write vcpu ctxt size");
+ goto out;
+ }
+
+ if (!write_exact(io_fd, &(ctxt), sizeof(ctxt)) ) {
+ ERROR("write vmcs failed!\n");
+ goto out;
+ }
+ }
+
+ /* Success! */
+ rc = 0;
+
+ out:
+
+ if (live) {
+ if(xc_shadow_control(xc_handle, dom,
+ XEN_DOMCTL_SHADOW_OP_OFF,
+ NULL, 0, NULL, 0, NULL) < 0) {
+ DPRINTF("Warning - couldn''t disable shadow
mode");
+ }
+ }
+
+ free(page_array);
+
+ free(pfn_type);
+ free(pfn_batch);
+ free(to_send);
+ free(to_skip);
+
+ return !!rc;
+}
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
Apparently Analagous Threads
Wisdom of the Ancients
